Singer Luke Bryan performs onstage during the 2014 iHeartRadio Music Awards held at The Shrine Auditorium on May 1, 2014 in Los Angeles, California. iHeartRadio Music Awards are being broadcast live on NBC.

Musician Pharrell Williams speaks onstage during the 2014 iHeartRadio Music Awards held at The Shrine Auditorium on May 1, 2014 in Los Angeles, California. iHeartRadio Music Awards are being broadcast live on NBC.

Rapper/host Pitbull (R) accepts the Best Collaboration award for 'Timber' from musician Pharrell Williams (L) onstage during the 2014 iHeartRadio Music Awards held at The Shrine Auditorium on May 1, 2014 in Los Angeles, California. iHeartRadio Music Awards are being broadcast live on NBC.

Rapper/host Pitbull accepts the Best Collaboration award for 'Timber' onstage during the 2014 iHeartRadio Music Awards held at The Shrine Auditorium on May 1, 2014 in Los Angeles, California. iHeartRadio Music Awards are being broadcast live on NBC.

Singer Adam Lambert speaks onstage during the 2014 iHeartRadio Music Awards held at The Shrine Auditorium on May 1, 2014 in Los Angeles, California. iHeartRadio Music Awards are being broadcast live on NBC.

DJs Matt Stafford (L) and Chris Stafford of the Stafford Brothers perform onstage during the 2014 iHeartRadio Music Awards held at The Shrine Auditorium on May 1, 2014 in Los Angeles, California.

Photo: Getty Images

Singer Dan Smith of Bastille performs onstage during the 2014 iHeartRadio Music Awards held at The Shrine Auditorium on May 1, 2014 in Los Angeles, California. iHeartRadio Music Awards are being broadcast live on NBC.

Singer Dan Smith of Bastille performs onstage during the 2014 iHeartRadio Music Awards held at The Shrine Auditorium on May 1, 2014 in Los Angeles, California. iHeartRadio Music Awards are being broadcast live on NBC.

Singer Dan Smith of Bastille performs onstage during the 2014 iHeartRadio Music Awards held at The Shrine Auditorium on May 1, 2014 in Los Angeles, California. iHeartRadio Music Awards are being broadcast live on NBC.

Singer Dan Smith (C) and Bastille perform onstage during the 2014 iHeartRadio Music Awards held at The Shrine Auditorium on May 1, 2014 in Los Angeles, California. iHeartRadio Music Awards are being broadcast live on NBC.

Actor/musician Jared Leto accepts the Best New Artist award on behalf of singer/songwriter Lorde (not pictured) onstage during the 2014 iHeartRadio Music Awards held at The Shrine Auditorium on May 1, 2014 in Los Angeles, California.

Photo: Getty Images

Rihanna, winner of Artist of the Year, Best Fan Army, and Hip Hop/R&B Song of the Year, onstage during the 2014 iHeartRadio Music Awards held at The Shrine Auditorium on May 1, 2014 in Los Angeles, California.

Rihanna, winner of Artist of the Year, Best Fan Army, and Hip Hop/R&B Song of the Year, blows kisses to her fans during the 2014 iHeartRadio Music Awards held at The Shrine Auditorium on May 1, 2014 in Los Angeles, California.

Usher dances to Michael Jackson's new music off of his upcoming posthumous album Xscape during the 2014 iHeartRadio Music Awards held at The Shrine Auditorium on May 1, 2014 in Los Angeles, California.

Usher dances to Michael Jackson's new music off of his upcoming posthumous album Xscape during the 2014 iHeartRadio Music Awards held at The Shrine Auditorium on May 1, 2014 in Los Angeles, California.

Musicians Dan Reynolds, Daniel Platzman, Ben McKee, and Wayne Sermon of Imagine Dragons accept the Alternative Rock Song of the Year award for 'Demons' onstage during the 2014 iHeartRadio Music Awards held at The Shrine Auditorium on May 1, 2014 in Los Angeles, California.

Linkin Park's Chester Bennington wins iHeartRadio Young Alt Rock Song of the Year ROCK SONG OF THE YEAR during the 2014 iHeartRadio Music Awards held at The Shrine Auditorium on May 1, 2014 in Los Angeles, California.

Actor/musician Jared Leto of 30 Seconds to Mars performs onstage during the 2014 iHeartRadio Music Awards held at The Shrine Auditorium on May 1, 2014 in Los Angeles, California. iHeartRadio Music Awards are being broadcast live on NBC.

Rihanna, winner of Artist of the Year, Best Fan Army, and Hip Hop/R&B Song of the Year, onstage during the 2014 iHeartRadio Music Awards held at The Shrine Auditorium on May 1, 2014 in Los Angeles, California.

Singer Shakira performs onstage during the 2014 iHeartRadio Music Awards held at The Shrine Auditorium on May 1, 2014 in Los Angeles, California. iHeartRadio Music Awards are being broadcast live on NBC.

Musician Blake Shelton (R) accepts the Country Song of the Year award for 'Boys 'Round Here' from radio personality Bobby Bones onstage during the 2014 iHeartRadio Music Awards held at The Shrine Auditorium on May 1, 2014 in Los Angeles, California.

Musician Avicii (L) accepts the EDM Song of the Year award for 'Wake Me Up' from rapper Juicy J onstage during the 2014 iHeartRadio Music Awards held at The Shrine Auditorium on May 1, 2014 in Los Angeles, California.

Singer Gwen Stefani speaks onstage during the 2014 iHeartRadio Music Awards held at The Shrine Auditorium on May 1, 2014 in Los Angeles, California. iHeartRadio Music Awards are being broadcast live on NBC.

Musician Pharrell Williams (R) accepts the iHeartRadio Innovator Award from singer Gwen Stefani (L) onstage during the 2014 iHeartRadio Music Awards held at The Shrine Auditorium on May 1, 2014 in Los Angeles, California.

Pharrell Williams is all smiles after Gwen Stafani presents him with the iHeartRadio Innovator Award during the 2014 iHeartRadio Music Awards held at The Shrine Auditorium on May 1, 2014 in Los Angeles, California.

Musician Pharrell Williams (R) accepts the iHeartRadio Innovator Award from singer Gwen Stefani (L) onstage during the 2014 iHeartRadio Music Awards held at The Shrine Auditorium on May 1, 2014 in Los Angeles, California.